June 22nd:Singapore PM2.5 based AQI is now updated on a hourly basis. Thanks to Singapore National Environment Agency for making this happen.If you wonder why PM2.5 AQI is so relevant compared to PM10 (since PSI is only using PM10 data), please check the article about why is PM2.5 often higher than PM10.

May 20th:Shenyang (沈阳) Air Quality information is now based on 3 stations. More information available in the faq.

May 11th: The city geo-location system (i.e. city position on the map) has been updated to take into account a growing number of cities.In case you notice any issue with the geo-location, such as any city wrongly located on the map, please inform us.

May 6th: The Air Quality data information for Japan is progressively going back to normal. If you notice any issue, please contact us.

March 15th: The Beijing AmCham is organizing a session on 'Air Pollution and Health: What You Can Do to Minimize Risk?' on Thursday March 21st 2013. More information available here.

March 11th: We apologize for the service break which happened from Sunday 23PM until today, Monday, 9PM. This break was due to our web hosting provider.

February 21st: Our new back-end server roll-out is started - with the objective to improve the incoming traffic bandwidth. If you notice any strange issue, please contact us.